The shoulder is the most flexible joint in the body.It allows one to place and rotate one’s arm in many positions in front, above, to the side, and behind one’s body. This flexibility also makes the shoulder susceptible to instability and injury. Depending on the nature of the problem,non-surgical methods of treatment often are recommended before surgery. However, in some instances, delaying the surgical repair of the shoulder can increase the likelihood that the problem will be more difficult to treat later. Early, correct diagnosis and treatment of shoulder problems can make a significant difference in the long run. Shoulder instability may be acute and chronic, traumatic and a traumatic : anterior (most often in 95% cases), posterior, inferior and multi-directional. Luxation can be treated conservatively (orthosis, physical therapy),but surgical treatment is often required. In younger patients if shoulder luxation was caused by trauma, surgical treatment is almost always necessary. Arthroscopy is used to stabilize the shoulder.